Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Catherine Gregg, CRNP

Nurse Practitioner in Upper St Clair, PA · enumerated 2022.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1043958374

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Registry record

Entity type Individual (Type 1)

Name Catherine Gregg

Credential CRNP

Sex Female

Practice address Upper St Clair, PA, 15241

Phone (412) 595-7681

Enumeration date May 25, 2022

Last updated in NPPES May 25, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License SP020933 (PA) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

What specialty is Catherine Gregg?

Catherine Gregg is registered in NPPES with the primary taxonomy of Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-05-25.